Unisonic 790RM-C Handheld Electronic Calculator

Object Details

Unisonic

Description

This handheld electronic calculator has a metal and plastic case and an array of twenty-five square plastic keys. In addition to ten digit keys and a decimal point key (in white), it has total, four arithmetic function, exchange, change sign, percentage and clear/clear entry keys (in turquoise). In addition it has a square root key and four memory keys (in orange). A mark behind the keyboard reads: Unisonic 790RM. The on/off switch is to the right of this. Behind the keyboard is an eight-digit green vacuum fluorescent display.

A power jack is on the top edge.

The back of the calculator has a sticker giving calculation examples. It reads in part: 790RM-C. It also reads in part: SERIAL NO. (/) 127212 (/) MADE IN JAPAN. Below this is a compartment for four AA batteries.

The calculator has a black plastic sleeve. Also stored in the sleeve is a pamphlet entitled Unisonic 790RM 8 Digit Pocketable Calculator . . . Instruction Manual. Writing on the last page of the manual indicates that the calculator was purchased August 27, 1976.

Compare 1986.0988.117 (Unisonic 790R-C) and 1986.0988.118 (Unisonic 790RM-C). Similar in general shape of the case are 1986.0988.116 (Unisonic 796-A), 1986.0988.115 (Unisonic 799-A), and 1986.0988.112 (Unisonic 1299R-A).

The calculator.org website indicates that the Unisonic 790RM was both introduced and discontinued in 1978. It also refers to a Unisonic 790RM-1 introduced in 1975. The MyCalcDB website shows a 1978 Unisonic 790RM, taken apart to show a Texas Instruments chip made in Singapore.

Location

Currently not on view

Credit Line

Gift of John B. Priser

1976

ID Number

1986.0988.118

accession number

1986.0988

catalog number

1986.0988.118

Object Name

electronic calculator

Other Terms

electronic calculator; Handheld

Physical Description

plastic (keys; part of case material)

metal (case; circuitry material)

glass (display material)

paper (manual material)

Measurements

overall: 1 1/4 in x 3 1/2 in x 6 in; 3.175 cm x 8.89 cm x 15.24 cm

place made

Japan

See more items in

Medicine and Science: Computers

Computers & Business Machines

Handheld Electronic Calculators

National Museum of American History

Record ID

nmah_334532

Metadata Usage (text)

CC0

GUID (Link to Original Record)

https://n2t.net/ark:/65665/ng49ca746b2-5eb2-704b-e053-15f76fa0b4fa